Method for preparing no cut crystallitic polysilicon chip in use for high performance solar batteries

A technology for solar cells and polycrystalline silicon wafers, which is applied in the growth of polycrystalline materials, chemical instruments and methods, and single crystal growth. Less loss and better control accuracy

Inactive Publication Date: 2007-12-26
陆大荣
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of high-purity microcrystalline polycrystalline silicon wafers produced by cutting methods in the existing solar cell preparation process, the process steps are complicated, and the overall cost is difficult to reduce. A method for preparing high-purity microcrystalline polycrystalline silicon wafers for solar cell raw materials. This method realizes controllable processing and drawing speed, controllable temperature field, controllable grain size, controllable crystal orientation, and wafer thickness through electronic precision control technology equipment. Controllable and controllable doping degree, the thickness of the microcrystalline polycrystalline silicon wafer made by it is 0.2-0.4mm, which is suitable for the preparation of large-area high-efficiency solar cells

Method used

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Effect test

Embodiment 1

[0011] Purchase 1000 grams of silicon raw materials with a purity higher than 9999 from the commercially available silicon crystal products, place them in a high temperature crucible and heat them to 1420 ℃ under constant temperature control. The electronic precision control stretching equipment is used to control the electronic temperature controller. Next, the molten silicon liquid is drawn at a high speed into a long piece of microcrystalline polycrystalline silicon wafer with a thickness of 0.3mm and a width of 10cm, and is arranged into a ready-to-use product.

Embodiment 2

[0013] Choose 1500 grams of silicon raw material with a purity higher than 9999 from the commercially available silicon crystal products and add the dopant boron in a regular amount, and place it in a high temperature crucible under constant temperature control and dust-free conditions to heat to 1450°C. Under the control of the electronic temperature controller of liquid level float technology, the molten silicon melt is floated and stretched into a long piece of microcrystalline polycrystalline silicon wafer with a thickness of 0.35mm and a width of 6cm and arranged into a ready-to-use product.

[0014] The silicon wafer products prepared in the above two embodiments are used in the preparation of solar cells, and the raw material cost is reduced by more than 50%, the comprehensive manufacturing cost is reduced by more than 35%, and the efficiency of the manufactured battery can reach 10-18%.

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Abstract

This invention relates to a cutting-free method for preparing microcrystalline polysilicon sheets used in high-performance solar cell. The method comprises: supplying silicon raw material, washing and purifying to obtain high-purity silicon, adding a dopant, placing in an electrically controlled high-temperature melting furnace without dust, heating to 1400-1500 deg.C to absolutely melt silicon, processing into microcrystalline polysilicon sheets (thickness = 0.2-0.4 mm) via uniform stretching or molten-tin flotation method, and processing to obtain high-purity microcrystalline polysilicon sheets with uniform length and width. The method has such advantages as low wastage, high control precision and high product quality.

Description

Technical field: [0001] The invention relates to a method for directly preparing microcrystalline polycrystalline silicon wafers for high-efficiency solar cells by adopting a horizontal stretching process, in particular to a process for preparing high-purity microcrystalline polycrystalline silicon wafers for solar cells using a non-cutting molten horizontal stretching technique method. Background technique: [0002] Due to the deterioration of the world's environment and the depletion of oil and coal resources, clean energy is increasingly being valued and favored by people. In particular, the collection and utilization of solar energy technology and equipment are increasingly being used by people. The research and development of solar energy technology and equipment is developing rapidly, with an annual output value of nearly 10%. 10 A high-tech industry of the dollar level. The development of solar energy harvesting technology has greatly reduced the cost of solar energy. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/06C30B29/64C30B28/04
Inventor 陆大荣王庆凯谢宏祖马瑾宗福建陆洁
Owner 陆大荣
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